Abstract
[reaction: see text] A new three-component halo aldol reaction has been discovered for the tandem formations of I-C/C-C bonds by activating the alpha',beta-positions of alpha,beta-acetylenic ketones. The key intermediates, 1-iodo-3-siloxy-1,3-butadienes, were generated from allenolates and directly monitored by (1)H NMR spectroscopic analysis. Excellent geometric selectivity (>95%) and good yields (65-82%) have been achieved for 10 examples.
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